Unit - 4.1 Simple Machine And Their Importance — PHYSICS STD 6 — Question

Write the correct statements :
A hand grinder is an example of a pulley.

Name the type of force which act in the following case:
A horse moves a cart

Can you bring two similar poles of two different magnetic close together easily ? Why ?

Give one example of changes the direction of motion to indicate that the application of a force?

Write the correct statements :
When a soft iron rod is placed in an insulated coil carrying current, it changes into permanent magnet.

Answer the following in detail.
Which is the most suitable unit for measuring the volume of air inside an inflated balloon?

Answer the following.
What is meant by luminous intensity? What is one lumen?

Select the correct statement :
(a) A wheel barrow is a lever of class I.
(b) The efficiency of a machine is always 100%
(c) Friction in moving parts of a machine reduces its efficiency.
(d) No lever has the mechanical advantage greater than 1.
(e) It is easier to lift a load vertically up than to push it along an inclined plane.
(f) A screw is made by two inclined planes placed together.

write the correct statement :
One kilometre is equals to 100 metres

The efficiency of a machine is always less than 100%.